You also don't want to be someone's last meeting of the workday, because there's a good chance the interviewer's attention might not solely be on you. They could be thinking about priorities that they have after work, for example, such as dinner plans, kids' homework, etc.

Also, avoid interviewing pre or post-lunch because your time with them could either be cut short or you could be left waiting for a long time.

2. The weather on the day of your interview

University of Toronto researchers Donald Redelmeier and Simon D. Baxter found that medical school applicants fared worse if they interviewed on a rainy day compared to sunny day interviewees.

They say: 'Overall, those interviewed on rainy days received about a 1% lower score than those interviewed on sunny days. This pattern was consistent for both senior interviewers and junior interviewers. We next used logistic regression to analyse subsequent admission decisions. The difference in scores was equivalent to about a 10% lower total mark on the Medical College Admission Test.'

The data included nearly 3,000 applicants over a six-year period.

3. How early you arrive

You may think it will look good if you arrive early -- but if you're excessively early, you could be hurting your chances.

'Of course arriving a few minutes early is a good idea, and is certainly better than arriving late -- but don't show up a half hour before your interview,' says Lynn Taylor, a national workplace expert and the author of 'Tame Your Terrible Office Tyrant: How to Manage Childish Boss Behaviour and Thrive in Your Job.' 'It can make you appear too anxious or put pressure on the interviewer. If you have extra time, gather your thoughts in your car or take a brief walk to get your energy up.'

4. Whether your rival also interviews on the same day

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Yes, it may be difficult to know when your rival is interviewing, but if you happen to know, schedule your interview on a different day. Basically, research shows that whether or not you're considered qualified for a position depends on who else is applying for the job.

'People are averse to judging too many applicants high or low on a single day, which creates a bias against people who happen to show up on days with especially strong applicants,' according to a study in the journal Psychological Science.

However, this comparison only lasts for one day, which means that you are only compared to people who are interviewing on the same day as you -- not the day before or after.

According to Cuddy, this will increase your abstract thinking abilities, pain threshold, risk tolerance, and levels of testosterone, the dominant hormone that makes you feel more confident and powerful. Feeling powerful will make you more assertive, accept criticism more gracefully, present more captivating and enthusiastic speeches, and, overall, turn you into a high performer.

You can do these poses in an elevator or even a bathroom stall. Just make sure you're alone so that you can really focus on the change in your body chemistry.

6. What you do while waiting in the lobby

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'Drinking coffee, eating, or talking on your cell is not the first impression you want to make with the hiring manager -- or the receptionist,' says Taylor. 'You don't know exactly when the interviewer will show up, so be at the ready.'

She suggests keeping one hand free so that you can quickly shake hands without awkwardly placing all your personal items on a chair or on the floor. 'You want to appear organised and attentive.'

'Also, as you wait, either make conversation with the receptionist (if he or she is available to talk), review notes from your notebook, or review any company materials for guests. Maintain a pleasant smile and upbeat demeanour.'

'A lot of our job candidates are from out of town, and we'll pick them up from the airport in a Zappos shuttle, give them a tour, and then they will spend the rest of the day interviewing,' Hsieh says. 'At the end of the day of interviews, the recruiter will circle back to the shuttle driver and ask how he or she was treated. It doesn't matter how well the day of interviews went, if our shuttle driver wasn't treated well, then we won't hire that person.'

8. Your handshake

As in any business or networking situation, a weak, tentative handshake conveys a lack of confidence, Taylor says. 'And this gesture is a key part of your first impression.'

Make sure you convey your self-assurance with a firm handshake and a smile on your face -- and don't be afraid to take the initiative in reaching out. 'Some people go overboard, however. You don't need to cause injury to make your point.'

9. If you accept the offered coffee

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If they offer you something to drink besides water -- especially coffee -- don't accept it.

11. The colour of your clothing

According to 2,099 hiring managers and human resource professionals who participated in a CareerBuilder survey, blue and black are the best colours to wear to a job interview, and orange is the worst.

Conservative colours, such as black, blue, grey, and brown, seem to be the safest bet when meeting someone for the first time in a professional setting, whereas colours that signal more creativity, like orange, may be too loud for an interview.

Red is the most powerful colour, but consider whether you want to outshine your interviewer. This, of course, depends on what role you're interviewing for and the culture of the company.

13. Sitting before you're asked to

Show respect of your interviewer's space by waiting for them to offer you a seat, or wait for them to sit first.

After you sit, Molidor and Parus say to 'sit tall with squared up shoulders and try to occupy as much space in the chair as possible. Don't be like a shrinking violet with a bowed head, no eye contact, and slouching shoulders.'

15. The way you make eye contact in a panel interview

Keep everyone's attention in a panel interview by making eye contact with different people at specific times during your response, say Molidor and Parus.

'In a panel interview, always begin your response by making eye contact with the person who asked you the question. Then make random and soft eye contact with each of the other interviewers. As you finish up your response, return your eye contact to the person who asked you the question. Do not mow down the interviewers by going down the line making eye contact after the other. Soft random eye contact does the trick.'

16. Your posture

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'When you're in the interview, your default should be sitting straight and keeping a pleasant smile on your face,' Taylor says.

Avoid slumping in your chair and remember to lean forward, showing interest in the interviewer. 'Even if you feel the discussion is going south, maintain your poise, posture and inflection. That can sometimes help you turn things around.'

19. Where you grew up

It's clearly unfair (and out of your control), but your interviewer may not even be consciously aware that she's biased toward Californians. It's called the similarity-attraction hypothesis: People simply gravitate toward those who are similar to them in some capacity.

There are a few potential explanations for this phenomenon. One is that people with a decent level of self-esteem are satisfied with their personalities, so when they see their qualities reflected in someone else, they like that person, too.

Another idea is that humans have evolved to like people who look and act the way they do. At one point in human history, the safest bet was to only trust people in your small social group.

That's because your interviewer might worry that you'll threaten his status in the organisation. And that's especially true in organisations with highly competitive cultures.

Of course, you should still put your best foot forward in any job interview. If the company doesn't hire you because they feel threatened, you might not want to work there anyway.

21. The sound of your voice

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In the near future, some companies may begin analysing candidates' voices to determine if they'd be good fits, according to an NPR report.

Essentially, an algorithm would determine whether your voice is engaging, calming, or trustworthy -- which could be especially important in industries like hospitality and retail.

Humans would have the final say on hiring.

22. Whether you're smiling

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It's common sense that flashing a smile makes you look friendlier and more approachable.

But research suggests that, for certain professions, smiling too much can undermine your success in a job interview.

In one study, researchers asked college students to role-play job interviews. They found that students who played candidates for the position of newspaper reporter, manager, and research assistant were less likely to get the hypothetical job when they smiled -- especially during the middle of the interviews.

23. Your accent

Research suggests that some employers may discriminate against candidates for executive positions when the candidates have foreign accents. Specifically, the employers may believe that those candidates have less political skill.

This is another example of completely unfair discrimination, and the researchers behind the study say companies should add accent-bias awareness training to existing training programs for hiring managers.

24. Your weight

In the study, men and women rated digital resumes that included photographs of non-obese people and digitally altered photographs of those same people as obese. As it turns out, obese candidates were rated significantly less competent than non-obese candidates.

Right now, Michigan is the only state that has a law against weight discrimination -- there's no protection under federal law. But if you feel that weight discrimination has affected your chances of landing a job, you can get in touch with the Equal Employment Opportunity Commission or the American Civil Liberties Union.

25. Whether you have tattoos or piercings

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A Salary.com survey found that some 76% of people say tattoos and piercings hurt a job candidate's chances of getting hired.

Your body art might stand out more in certain fields -- for example, the survey found that just 8% of government workers have tattoos, compared to 20% of those in the hospitality, tourism, and recreation industries.

26. Your body language

Experts say that when people like each other they mirror each other's body posture and movements. In a way, it looks like like the two people are 'dancing.'

If you don't mirror your interviewer's body language, it might seem like you're not interested in what they're saying or even that you're lying.

Obviously, you don't need to go to extremes here -- like scratching your nose every time your interviewer does. But if they're leaning forward in their chair or sitting with their legs crossed, you can subtly mimic these behaviours.

27. How sweaty you are

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Offering a clammy palm to shake the hiring manager's hand is the greatest fear of many a job candidate.

One public relations recruiter tells US News that she recommends asking for a cold cup of water while you're waiting to be called in for your interview. That way, you'll lower your body temperature and stop some of the sweating.

28. When you send your thank-you note

We all know how important it is to follow up after a job interview with a thank-you note -- but not everyone realises that when they send it can be just as important.

If you wait too long, the hiring manager may forget about you or assume you you're not interested in the job. It may also make you seem like a slacker.

'The best timeframe to send a thank you email is within 24 hours after your interview,' Whitney Purcell, associate director of Career Development at Susquehanna University, previously told Business Insider. 'It should be sent during business hours -- no 3 a.m. emails that make your schedule seem a little out of whack with the company's traditional hours.'